Recommended for "Power-Users," or those people that are comfortable working in Office, etc. Not for techies, per se, and perhaps a bit much for the average user. Get it for those people that will comfortably read a 300 page book on a computer program and then actually do something with it. Don't get it for those whose permissions you wouldn't dare leave without significant restrictions.
Has been very helpful to me as someone new to SharePoint. Only 4 stars because it's a bit much for the average user that we have in our organization -- I 'm not sold that I could distribute this as a User's Guide and expect increased understanding of how it works from the typical user. Perhaps it takes this much detail to present the information, but the lack of a general "how-to" or "quick-start" section makes me think that most users will be intimidated by the size and scope of the book and never crack it open.
However, from a Power User perspective, this book is excellent. The writing is clear and well-organized. I've been able to find just about everything I've needed to understand and answered most questions that have come to mind. I like how the book presents the different choices available, without shoe-horning you into the author's preferred choice. Comparing it to explanations available online, the information it typically presented better in this book.